CN102165640A - Suspended dielectric combline cavity filter - Google Patents
Suspended dielectric combline cavity filter Download PDFInfo
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- CN102165640A CN102165640A CN2009801131248A CN200980113124A CN102165640A CN 102165640 A CN102165640 A CN 102165640A CN 2009801131248 A CN2009801131248 A CN 2009801131248A CN 200980113124 A CN200980113124 A CN 200980113124A CN 102165640 A CN102165640 A CN 102165640A
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- cavity
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- rod
- combline
- mounting structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
Abstract
A combline filter has a ceramic resonator disposed inside at least one cavitywall. Because the resonator is implemented as a hollow rod, a tuning element may be inserted into an opening on 5 the top ofthe rod to tune its frequency. A mounting element, inserted into an opening on the bottomofthe rod secures its position inside a cavity resonator. Instead of soldering the resonator to the filter's walls, the resonator is supported above a bottom or side wall of the cavityresonator.
Description
Technical field
The present invention relates in general to the comb line filter that is used for microwave and radiofrequency signal, and relates more particularly to be used for hanging on cavity the structure of ceramic resonator.
Background technology
Coaxial comb line filter is widely used among the wireless communication system.More specifically, these equipment are usually used in the elimination unwanted frequency.When being embodied as band pass filter, the user can tuning comb line filter select to be called as the expected frequency range of passband, and abandons from the signal that is higher or lower than expected range in the frequency range.Described filter is commonly called comb line filter, because it comprises a series of parallel organizations similar to the broach on the comb.
Cavity resonator constrains in electromagnetic radiation within the solid structure, and it forms cuboid usually.Because this cavity plays the effect of waveguide, therefore electromagnetic pattern be limited to can with matched those ripples of wave guide wall on.This restricted mode of the transverse mode formula that is commonly called that ripple is propagated according to the direction that ripple is propagated, can be analyzed with several classes.
Transverse electric (TE, Transverse Electric) pattern does not have electric field on the direction of propagation.In contrast, horizontal magnetic (TM, Transverse Magnetic) pattern does not have magnetic field on the direction of propagation.Transverse electromagnetic (TEM, Transverse Electro-Magnetic) pattern neither has electric field and does not also have magnetic field on the direction of propagation.The TEM pattern may reside among the cable, and TE and TM pattern then are present in limited waveguide, in cavity resonator.Although the TEM pattern can be present among the waveguide with desirable conductive walls in theory, real cavity resonator has lossy wall, so it can not support any TEM mode signal.
When the design cavity resonator, the TM pattern is useful especially.In order to limit the TM mode signal in cavity resonator, electric field is propagated along the center of waveguide.Because standing wave pattern, electric field and magnetic field level off to zero along the metallic walls of resonator.Tuning in order to converge electric field and to allow the user that it is carried out, placed cavity among the hollow space in being defined in the filtering wall.
If the center resonator in the comb line filter is a metal, the quality factor that is commonly called the Q factor so will be relatively poor.The frequency of this measurement and resonator is directly proportional divided by the merchant of its conductivity, if therefore described resonator is to be made by the electric conducting material such as metal, the so non-loaded Q factor will be relatively low.Therefore, some conventional filters use and have more that the ceramic resonator of high-k has substituted metal resonators.
In such filter, the ceramic material non-metallic rods in the center of waveguide allows tuning more accurately to signal frequency, and the typical conductivity loss that does not produce metal resonators.In the circulation of the circumference of cylindrical bar, the discontinuity of dielectric constant on resonator surface allows within it portion to the support of standing wave in magnetic field.Therefore, electric field will be along the major axis circulation of cylindrical resonator.
Because such resonator is normally hollow, therefore can inserts tuning bolt in the hole in pottery, thereby allow easy adjusting the resonance frequency of rod.The user can little by little advance tuning bolt, carefully monitors the variation that causes in frequency.The certain depth of inserting will be associated with predictable resonance frequency.
In traditional TM pattern dielectric comb line filter, the dielectric in the ceramic resonator of filter must be electrically connected with shell.This connection often needs to use complicated technology.For example, conductive metal layer as the copper layer, can be applicable to the outside of ceramic resonator.But in these were implemented, it may be difficult making Stability Analysis of Structures, because it will be subjected to the infringement of mechanical oscillation easily.And pottery may have different thermal coefficient of expansions with metal material, so heating and cooling may weaken the intensity of pottery and metal junction.
Because copper oxidation can take place among being exposed to air the time, therefore often will add second metal level protects copper.Usually, manufacturing process relates to plumbous passivation layer of interpolation or tin passivation layer on the copper layer.Except protecting easily impaired copper layer, this metal is suitable for the ceramic component body is welded among the shell.After using these metal level coating ceramic resonators, use welding, be coupled to metal shell with resonator with coating.Unfortunately, coating and welding step all relate to uses complicated metallurgical technology, and it is costliness but also time-consuming not only.
Therefore, there are needs, make required equipment and technology thereby simplify it for the resonator that can avoid using a plurality of metal levels.In addition, exist for the needs of under the situation of the conductive wall that resonator is not directly connected to cavity, resonator being inserted in the cavity.
Summary of the invention
For the needs that in cavity, hang resonator, showed the short summary of various example embodiment at current here.May make some simplification and omission in following summary, this is for outstanding and introduce some aspects of various example embodiment, rather than in order to limit its scope.In part subsequently, will describe in detail being enough to that those of skill in the art are made and using the preferred example embodiment of notion of the present invention to make.
In various example embodiment, comb line filter has realized the performance identical with conventional comb line filter under the situation that does not need to use scolder resonator to be connected to shell.This simplifies the structure greatly.Therefore, in various example embodiment, in cavity, support resonator and it is lifted on cavity by mounting structure, rather than come the coated with ceramic resonator so that it is coupled to cavity with metal level by suspended structure.This structure arrangement has been eliminated the needs for the complicated technology of the necessary interpolation copper of conventional resonator and tin-lead layer.
Correspondingly, in various example embodiment, the dielectric combline cavity resonator comprises: cavity, and it has at least one conductive wall, and this conductive wall defines and is used to retrain electromagnetic space; The ceramic resonator rod, it has interior girth and the outer perimeter that is limited for the first and second relative surfaces, and wherein rod is positioned in the cavity under the situation of at least one metallic walls that does not contact cavity; Tuned cell, it is coupled to rod with the cavity electromagnetic ground, and described tuned cell is by installing the first surface that meshes rod in the girth within it; And mounting structure, it is suspended on rod in the cavity.
In various example embodiment, cavity can be to have end face, bottom surface, and the cuboid of four sides.Rod can be operated among horizontal magnetic (TM) pattern.
In various example embodiment, mounting structure can comprise installation elements, and it is by installing the second surface that meshes rod in the footpath within it.Mounting structure can also comprise the alumina layer, and it separates the second surface of cavity from rod.
Alternatively, mounting structure can comprise at least one polymer wedge, and it is fastened on rod in the cavity.Mounting structure can also comprise at least one tightening member, and it is coupled to cavity with described at least one polymer wedge.
In various example embodiment, at least one conductive wall of cavity can be a metal.Alternatively, described at least one conductive wall can be made by metallized polymeric.
In various example embodiment, band pass filter has in selected frequency range and the specific bandwidth on the centre frequency, filter comprises a plurality of suspension combline cavity resonator, wherein each cavity resonator comprises: cavity, it has at least one metallic walls, and this metallic walls defines and is used to retrain electromagnetic space; The ceramic resonator rod, it has interior girth and the outer perimeter that limits for the first and second relative surfaces, and wherein rod is positioned in the cavity under the situation of at least one metallic walls that does not contact cavity; Tuned cell, it is coupled to rod with the cavity electromagnetic ground, and described tuned cell is by installing the first surface that meshes rod in the girth within it; And mounting structure, it is suspended on rod in the cavity.
In various example embodiment, the mounting structure of each cavity resonator can comprise installation elements, and it is by installing the second surface that meshes rod in the girth within it.The mounting structure of each cavity resonator can also comprise the alumina layer, and it separates the second surface of cavity from rod.Alternatively, the mounting structure of each cavity resonator can comprise at least one polymer wedge, and it is fastened on rod in the cavity.The mounting structure of each cavity resonator can also comprise at least one tightening member, and it is coupled to cavity with at least one polymer wedge.
In various example embodiment, the cavity of filter can be the cuboid with end face, bottom surface and four sides.In various example embodiment, identical cavity can be used for stop-band filter, and it is also referred to as band resistance or band stop filter.Compare with band pass filter, such filter plays a role in opposite mode.Generally speaking, stop-band filter can be decayed and be selected the interior signal of frequency band, but allows signal in addition freely to pass through from it.
Description of drawings
In order to understand various example embodiment better the accompanying drawing of enclosing has been made reference, wherein:
Fig. 1 is the stereogram that TM pattern dielectric pectinate line cavity is hung in demonstration;
Fig. 2 is the cutaway view of demonstration cavity, and it has along the two dimensional cross-section of the axle intercepting of dielectric resonator;
Fig. 3 is the stereogram that sextupole point hangs the example configuration of dielectric pectinate line cavity filter;
Fig. 4 illustrates the frequency response chart of the exemplary filter of Fig. 3; And
Fig. 5 illustrates metal combline resonator and the combination of hanging the dielectric combline resonator.
Embodiment
With reference now to accompanying drawing,, similar therein numbering refers to similar assembly or step, and it discloses the wide in range aspect of various example embodiment.
Fig. 1 is the stereogram that TM pattern dielectric pectinate line cavity 100 is hung in demonstration.In various example embodiment, cavity 100 comprises tuned cell 110, resonator 120, supporting disk 130, and installation elements 140.Cavity 100 is limited by at least one conductive wall.In various example embodiment, such wall can be a metal, is perhaps made by metallized polymeric.
In various example embodiment, cavity 100 has the shape of cuboid.Therefore, cavity 100 can comprise end face, bottom surface and four sidewalls.As those of skill in the art will be appreciated that, cavity resonator can be manufactured to other shape except that cuboid, as spheroid or cylinder etc.
In various example embodiment, tuned cell 110 extends downwardly into cylindrical resonator 120 in the cavity 100 from the end face of cavity 100.The top of tuned cell 110 can be located substantially on the centre of the end face of cavity 100.The user can be adjusted by moving up or down tuned cell 110.This adjusting can change the resonance frequency of cavity 100 pro rata.
In various example embodiment, because resonator 120 has the form of hollow cylinder, moving in the hole on the top that can be inserted into resonator 120 of tuned cell 110 perhaps removes it from this hole.Like this, the user can accurately regulate the frequency of resonator 120.Alternatively, resonator 120 can have the shape that section is not annular but still interior girth of qualification and outer perimeter.In this case, tuned cell 110 must have the configuration that suitable shape is mated the interior girth of resonator 120.
And, though resonator 120 is depicted as along the vertical axis of cavity 100, can settle resonator 120 along other axle in the cavity 100.For example, it can be settled along the trunnion axis of cavity 100, and tuned cell 110 is in its left side.No matter how it disposes in cavity, and resonator 120 generally can be described to have interior girth and the outer perimeter that limits for its relative both sides.The interior girth of tuned cell 110 engagements one side, opposite side then is positioned at the offside of resonator 120.
In addition, in various example embodiment, ceramic material can be used for resonator 120.This ceramic material can have the dielectric constant far above air.
In various example embodiment, resonator 120 is not the bottom surface that always extends to cavity 100.On the contrary, supporting disk 130 separates the bottom surface of resonator 120 from the bottom surface of cavity 100.Therefore, in these embodiments, need not resonator 120 is welded to the wall of cavity 100.In various example embodiment, supporting disk 130 is made by alumina.Alumina, a kind of chemical formula are Al
2O
3Compound, be also referred to as aluminium oxide.But, should be understood that, can use any material with the equivalent attribute that is suitable for supporting resonator 120.
In various example embodiment, the alumina layer has and is essentially 9.8 dielectric constant.In addition, in various example embodiment, the loss angle tangent of layer is essentially 0.0005, has guaranteed to have only seldom power dissipation in supporting disk 130.In order to realize this dielectric constant and loss angle tangent, the manufacturing of supporting disk 130 can use purity to be essentially 99.5% alumina.But, should be understood that, can use material with the different attribute that is suitable for supporting resonator 120.
In various example embodiment, installation elements 140 is outstanding from the top of supporting disk 130.Installation elements 140 can be positioned at tuned cell 110 opposites, the centre of the supporting disk on the bottom of cavity 100 130 basically.Because installation elements 140 extends upward in the hole on the bottom of resonator 120, it is locked into the position with resonator 120 in cavity 100.
Fig. 2 is the cutaway view of demonstration cavity 200, and it has along the two dimensional cross-section of the axle intercepting of dielectric resonator.
In various example embodiment, replace the installation elements 140 shown in Fig. 1, adopted first and second polymer supports 230,235 in order to resonator 120 is locked into the position.Polymer support 230,235 can have two triangular cross-section, is positioned at any side of resonator 220.The bottom that first and second tightening members 240,245 can be coupled to cavity 200 with first and second polymer supports 230,235.Those of skill in the art should be understood that, can use the structure of equivalence to come fastening resonator 120, as long as support is fastened on resonator 120 on the position of the wall that can not touch cavity 200.For example, support 230,235 can be substituted by the single-piece around the outer perimeter of resonator 120.Those of skill in the art will know other configuration.
Fig. 3 is the stereogram that sextupole point hangs the example configuration of dielectric pectinate line cavity filter 300.Filter 300 comprises six independent cavitys 310,320,330,340,350 and 360.
As shown in Figure 3, sextupole point filter 300 comprises the cavity of contact type that Fig. 1 describes more than six.Independent cavity 310,320,330,340,350 and 360 is arranged at three and takes advantage of in two the array, with the frequency response of tuning electromagnetic wave in cavity 300 carefully.In top line, iris is coupled to cavity 320 with cavity 310, and cavity 320 is coupled to cavity 330.In similarly arranging, the iris in the end row is coupled to cavity 350 with cavity 340, and cavity 350 is coupled to cavity 360.Last iris will combine with 360 signal from cavity 330.
Fig. 4 illustrates exemplary frequency responses Figure 40 0 of the cavity 300 of Fig. 3.By comparing with the frequency of representing with megahertz (MHz) with the frequency response of decibel (dB) expression, this width of cloth figure has showed how the cavity configuration of Fig. 3 produces the response of sextupole point.Use described resonator can construct other filter function, comprise response with one or several transmission zero.
Fig. 5 illustrates the filter 500 that combines metal combline resonator 510,520 and hang dielectric combline resonator 530,540,550,560.In the left side of accompanying drawing, signal is received and is sent by metal combline resonator 510,520.First iris is to being coupled to dielectric resonator 530 with metal resonators 510, and metal resonators 520 is coupled to dielectric resonator 540.Second iris is to being coupled to dielectric resonator 550 with dielectric resonator 530, and dielectric resonator 540 is coupled to dielectric resonator 560.Last iris is by being coupled to dielectric resonator 560 with dielectric resonator 550, and will combine with signal from three resonators in bottom 520,540,560 from the signal of three resonators in top 510,530,550.
According to preamble, various example embodiment have been described the remarkable advantage than conventional comb line filter.In various example embodiment, hang the resonator rod directly contact surround the cavity wall of resonator rod, thereby eliminated being used for rod is welded to the needs of metallurgical technology of the complexity of shell.
Though describe various example embodiment in detail, should be appreciated that the present invention can have other different embodiment, and its details can be made amendment aspect tangible various with particular reference to its some demonstration aspect.As for conspicuous for the those of skill in the art, can implement in remaining on marrow of the present invention and scope to change and revise.Correspondingly, aforementioned disclosure, description, and accompanying drawing only makes the example illustrative purposes, and never be by any way the present invention to be made restriction, the present invention is only defined by claim.
Claims (10)
1. device, it comprises at least one combline cavity resonator, described at least one cavity resonator comprises:
At least one cavity, it has at least one conductive wall, and this conductive wall defines and is used to retrain electromagnetic space;
The ceramic resonator rod, it has interior girth and the outer perimeter that limits for the first and second relative surfaces, and wherein said rod with under the contacted situation of described at least one metallic walls be not placed in the described cavity;
Tuned cell, it is coupled to described rod with described cavity electromagnetic ground, and described tuned cell is by installing the described first surface that meshes described rod in the girth in described; And
Mounting structure, it is suspended on described rod in the described cavity.
2. according to the device of claim 1,
Wherein said rod works among horizontal magnetic (TM) pattern.
3. according to the device of claim 1,
Wherein said at least one conductive wall is a metal, is perhaps made by metallized polymeric.
4. according to the device of claim 1,
Wherein said device has at least two combline cavity resonator, and is provided at the logical function of specific band in the selected frequency response.
5. according to the device of claim 1 or claim 4,
Wherein said cavity is a cuboid, and it has end face, bottom surface and four sides.
6. according to the device of claim 1,
Wherein said device has at least two combline cavity resonator, and is provided at the specific belt-resistance function in the selected frequency response.
7. according to the device of claim 1, claim 4 or claim 6,
Wherein said mounting structure comprises installation elements, and it is by installing the described second surface that meshes described rod in the girth in described.
8. according to the device of claim 1, claim 4 or claim 6,
Wherein said mounting structure comprises the alumina layer, and it separates the described second surface of described cavity from described rod.
9. according to the device of claim 1, claim 4 or claim 6,
Wherein said mounting structure comprises at least one polymer wedge, and it is fastened on described rod in the described cavity.
10. filter, it comprises that at least one metal combline cavity resonator and at least one hang the combination of dielectric combline cavity resonator, to realize various filter functions, wherein each described suspension dielectric combline cavity resonator comprises:
Cavity, it has at least one conductive wall, and this conductive wall defines and is used to retrain electromagnetic space;
The ceramic resonator rod, it has interior girth and the outer perimeter that limits for the first and second relative surfaces, and wherein said rod with under the contacted situation of described at least one metallic walls be not placed in the described cavity;
Tuned cell, it is coupled to described rod with described cavity electromagnetic ground, and described tuned cell is by installing the described first surface that meshes described rod in the girth in described; And
Mounting structure, it is suspended on described rod in the described cavity.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/102,059 | 2008-04-14 | ||
| US12/102,059 US7777598B2 (en) | 2008-04-14 | 2008-04-14 | Dielectric combine cavity filter having ceramic resonator rods suspended by polymer wedge mounting structures |
| PCT/IB2009/052788 WO2009128053A1 (en) | 2008-04-14 | 2009-04-08 | Suspended dielectric combline cavity filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102165640A true CN102165640A (en) | 2011-08-24 |
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ID=41057564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801131248A Pending CN102165640A (en) | 2008-04-14 | 2009-04-08 | Suspended dielectric combline cavity filter |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7777598B2 (en) |
| EP (1) | EP2272126A1 (en) |
| JP (1) | JP5236068B2 (en) |
| KR (1) | KR101239209B1 (en) |
| CN (1) | CN102165640A (en) |
| WO (1) | WO2009128053A1 (en) |
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- 2009-04-08 KR KR1020107025395A patent/KR101239209B1/en active IP Right Grant
- 2009-04-08 CN CN2009801131248A patent/CN102165640A/en active Pending
- 2009-04-08 WO PCT/IB2009/052788 patent/WO2009128053A1/en active Application Filing
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| US5652556A (en) * | 1994-05-05 | 1997-07-29 | Hewlett-Packard Company | Whispering gallery-type dielectric resonator with increased resonant frequency spacing, improved temperature stability, and reduced microphony |
| US6002311A (en) * | 1997-10-23 | 1999-12-14 | Allgon Ab | Dielectric TM mode resonator for RF filters |
| JP2005086716A (en) * | 2003-09-10 | 2005-03-31 | Ngk Spark Plug Co Ltd | Tuning rod for dielectric resonator, manufacturing method thereof, and dielectric resonator employing the same |
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| WO2014101320A1 (en) * | 2012-12-24 | 2014-07-03 | Alcatel-Lucent Shanghai Bell Co., Ltd. | An adjustable coupling for use with an input resonator and/or an output resonator of a bandpass filter |
| CN112640202A (en) * | 2018-09-12 | 2021-04-09 | 京瓷株式会社 | Resonator, filter, and communication device |
| CN109244612A (en) * | 2018-09-28 | 2019-01-18 | 西南应用磁学研究所 | A kind of novel miniaturization pectination ceramic tube medium cavity body filter |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20090256652A1 (en) | 2009-10-15 |
| KR20110004441A (en) | 2011-01-13 |
| EP2272126A1 (en) | 2011-01-12 |
| JP5236068B2 (en) | 2013-07-17 |
| WO2009128053A1 (en) | 2009-10-22 |
| US7777598B2 (en) | 2010-08-17 |
| JP2011517253A (en) | 2011-05-26 |
| KR101239209B1 (en) | 2013-03-06 |
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